[Suggestion] List reason for "is not going to be installed"

cat /etc/issue
Ubuntu 12.04
sudo add-apt-repository ppa:videolan/master-daily
sudo apt-get update
sudo apt-get install vlc
Some packages could not be installed...
The following packages have unmet dependencies:
 vlc : Depends: vlc-nox (= 2.1.0~~git20120813+r1888-0~r82~precise1) but it is not going to be installed
       Depends: libvlccore5 but it is not going to be installed
       Recommends: vlc-plugin-notify (= 2.1.0~~git20120813+r1888-0~r82~precise1) but it is not going to be installed
       Recommends: vlc-plugin-pulse (= 2.1.0~~git20120813+r1888-0~r82~precise1) but it is not going to be installed
sudo apt-get install libvlccore5
Some packages could not be installed...
The following packages have unmet dependencies:
 libvlccore5 : Depends: vlc-data (= 2.1.0~~git20120813+r1888-0~r82~precise1) but 2.1.0~~git20120815+r1890-0~r82~precise1 is to be installed